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how to solve the width of the river without crossing it?

 
Tue Nov 30, 2010 7:05 am  by tartle

how to solve the width of the river without crossing it? if you only have a big protractor and a meter stick?
 
   
Sun Mar 20, 2011 12:33 am  by ChibiHoshi

Trig if you have line of site.

Look at a tree or rock exactly across, then parallel the river with your meter stick then determine the angle from your new point to the rock/tree.

Tangent of angle = width of river over the length traveled paralleling the river.
 
   
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